This appears to be by design, and the feedback is added as a part of the dropped elements.
This can be confusing when testing the accessibility, or when a blind person is told about the task from someone who's seen the feedback area.
Should we consider making the area un-hidden?
Bug that should be fixed either way: Even though the feedback is hidden the wrapper still adds a tabindex – which makes it tabbable but without any "visible" content or anything.
1. Determine if the current solution is best.
2. Fix tabindex bug.